Packing for piston-rods.



J. S. PENDLETON.

PACKING ER PISTON RODS.

APPLIOATION FILED 00T. l, 1909.

$63,645. Patented July 5, 1910.

l (fa/zw Sjwdfea JOHN S. PENDIJETON, OF'LINCLN, ILLINOIS.

PACKING FOR PISTON-RODS.

Specification of Letters Patent.

' -Iateiited July 5, 1910.

Afpiication inea october 1, i909. seriai N0. 520,491.

To all whom it may concern:

Be it knowii that l, JoIiN S; PENnLn'roN, a citizen of the United States, residing at Lincoln, in the county of Logan and State of Illinois, have inventedl new and useful Improvements in Pac-kings for Piston-Rods, of which the following is a specification.

This invention relates to improvements in packings for piston rods and the like, the object of the invention being to provide packing rings of novel construction whereby the escape of steam or otherl fluid around the rod will be effectually prevented and a fluid tight joint at all times maintained, and further to provide packing rings of a type which will automatically adjust themselves to compensate for wear and which may be inexpensively manufactured.` l

-Theinvention consists of the features of construction, combination and arrangement of parts hereinafter. fully described and claimed, reference being had to the accompanying drawing, in which Figure 1 is a ll-)ongitudinal section through a stufiing box showing the application of the invention. Figs. 2 and 3 are opposite side views of one of the intermediate packing..

rings, showing the same in compressed condition. Fig. 4 is a cross sectional view of the saine.` i l Referring to the drawing, 1 designates a piston or other like reciprocating rod, 2 a

stuffing box through which the saine extends,

and 3 the gland or follower operating in the stuffing box and secured thereto by bolts 4 and securing and jam nuts 5 and 6, whererequires. i

Arranged within the stufiing box is'a series of packing rings, comprising inner and outer terminal rings 7 and 8 and one or more intermediate rings 9, each of which is coin-v posed of rubber or any suitable elastic coni-4 position of which rings of this character are customarily made, said rings being molded or otherwise made into form. Each ,ring is by the follower may be adjusted as occasion .provided with a cent-ral opening 10 for' the passage of the piston rod and has a radial slit 11 leading therefrom, whereby the ring is rendered expansible andv contractible. The inner terminal ring'? is provided withl a flat inner abutting face 12 to bear against the inner end of the stuffing box while the outer terminal packing'ring 8 is rovided with a Hat outer abuttin face 13 to ear against the inner surface of t e gland or follower 3. Ir-

respective of the number of intermediate packing rings 9 employed, the inner terminal ring 7 of the series is formed upon itsA inner face with an annular flange 14 which is tapered or wedge shaped on cross section, while the inner face of the outer terminal ring 8 is formed with a correspondingly shaped annular recess 15. Each intermediate packing ring is formed upon its outer face with a flange 16 similar to the flange 14 and in its inner face'with a recessA 17 similar to the recess 15. As shown in the present instance, the flange of the ring 7 tits within the recess 17 of the inner intermediate packing ring, while the flange 16,0f said internie'diatering tits within the recess 17 of 'the outer intermediate packing ring, and the flange 16 of the last named ring ts within the recess 15 of the outerAv terminal packing ring, the peripheral surfaces of all of the rings contacting closely with the side wall of the stutiing box to'maintain a steam tight connection therewitha j It will be understood from the foregoing description that the walls of the openings A10 they are subjected to maintain a close fit under normal conditions against the surfaces of the rod and stuffing box, which action is promoted by the elasticity of the material. The openings l0 in the rings 8 and 9, of each ring provided with an annular recess, tapers toward the recessed face of the .ring to provide an intervening flexible ,wall or portion 18, which, when the ring is vfitted in position upon tie rod, will expand or be forced outwardly to rnakethe opening of uniform diameter and partially close the annular recess, leaving it only suf- -icieiit-ly open to receive the extremity of the -flange or projection of the coacting ring.

with.

iio

Primarily, the rings are adjusted by means of the gland 3 to bear with the desiredforce against the lwall, of the box and surface of the rod to prevent leakage. As Wear occurs upon the walls ofthe openings 10, the flexible' portions 18 of the recessed rings are forced by their elasticity and the pressure of the engaging anges 14 against the rod 1, whereby provision isv made for automatically ta up any wear that may occur. Whenit isl nessary to adjust the gland 3 inwardly to compensate for wear it will be understood that through the forcing of the rings together, the tapered llailges will be caused to Venter the recesses to a greater extent and spread the walls thereof further apart, thus "expanding the contact surfaces of the ring into engagement with the wall of the rod.

It will thus be seen that my invention provides a simple construction and arra ement of packing rings by which an efectiva box and the surface of the steam tightfjoint will be maintained and looseness from Wear to a certain degree automatically compensated for, and that by a simple adjustment of the gland any excess wearmay be readily and conveniently taken up. The material or composition of which the are made also enables them to be manufactured and sold at a comparatively low cost. l

1. A radially slit packing ring comprising an elastic body having a central opening of annular flaring form,and provided in one of its' faces with an annular flaring recess surrounding said opening, the portion of the ring between said opening and recess providing a normally conical flange adapted to be expanded to cylindrical formby the pressure of the piston rod.

2. A packing ring compris' a radially slit body of elastic material havmg a central opening of conical form at one side of said body, and provided in said side around said opening with an annular tapering recess, and upon its opposite side with an annular tapered projection, the portion of the body between the conical end of the opening and the recess providing a conical flange adapted to be expanded into cylindrical form by the piston rod, said flange being adapted to be compressed when expanded toward the rod by the tapered projection of a co-acting ring extendin into said recess;

In test1mon whereof I aiix my signature in presence o two Witnesses.

JOHN s. PENDLETON. 

